A data transmission method and transmitting site based on OFDM

The invention discloses a data transmission method based on OFDM, which is used for uplink data transmission in a short-to-middle-distance wireless communication system. The available frequency band of the system is divided into N basic frequency sub-bands in advance. The method includes: the transmitting site occupies M basic frequency sub-bands Frequency band, modulate the data to the M basic sub-bands and send it out; the receiving station receives the data sent from one or more transmitting sites within the N basic sub-bands; M≤N, M and N are both positive integer. The invention also provides an OFDM-based data transmission system. The present invention is based on the combination of OFDM technology and sub-frequency bands, allowing the transmitting site and receiving site in the wireless communication system to have different bandwidth configurations, the transmitting site can use a lower configuration to reduce hardware costs, and the receiving site can use a higher configuration to improve bandwidth. Efficiency: Spectrum utilization, throughput, etc., and enables multiple user sites to communicate with access points at the same time.